We were founded with a strong belief in every little bit counts meaning every little bit of avoided or reduced impact counts and every small change is progress. 


Co-Founder and Partner

Sarah Currie-Halpern

Before launching Think Zero, Sarah ran the Solid Waste and Zero Waste Programs for the NYC Mayor’s Office of Sustainability (MOS). Her work focused on implementing the Zero Waste Plan by increasing commercial, school, and NYCHA composting and recycling; encouraging waste reduction, reuse, and donation; reducing greenhouse gas emissions from waste, and developing and improving the waste policy citywide. She was on the team that created the Zero Waste section of OneNYC and led the Waste section of the 80x50 plan.


Sarah also ran the multi-agency Zero Waste Steering Committee, developed and led the Mayor’s Zero Waste Challenge, and pushed forward groundbreaking work around light pollution.


Sarah is a Board Member of Sanitation Foundation and Earth Day Initiative and she is the former Chair of the Manhattan Solid Waste Advisory Board (MSWAB), and a Board of Trustees Member of the College of the Atlantic and the Sanitation Foundation. 

Sarah holds a BS from Boston University School of Management and a certificate from New York University. She is certified as a TRUE Zero Waste Business Associate by GBCI.

Ushma has had a lifelong interest in sustainability and waste reduction. Before the term "zero waste" was coined, she was raising awareness about consumption and waste with her schoolmates and work colleagues.  


Prior to launching Think Zero, Ushma held senior management roles with American Express, Booz & Co., and Katzenbach Partners. She has worked on environmental issues with organizations such as the Environmental Defense Fund, the Department of Environment of the City of Chicago, and Acumen.      


Ushma is a member of the Manhattan Solid Waste Advisory Board (MSWAB) and the NYC chapter of the New York League of Conservation Voters. She was previously on the Board of Sustainable South Bronx, where she oversaw the for-profit subsidiary Cool Roofs that worked on cooling and greening roofs throughout NYC. 

Ushma holds degrees from Georgetown University, Columbia University and Harvard University. She is certified as a TRUE Zero Waste Business Associate by GBCI.


Co-Founder and Partner

Ushma Pandya Mehta

MSPH, Senior Associate

Belinda C. Chiu

Belinda is a public health professional, environmental justice activist, and the sustainability content creator and educator behind the platform A Healthy Blueprint. Prior to joining the Think Zero team as a senior associate, she worked at a global advocacy organization supporting 1,000 youth advocates in their work to advance gender equality and sexual and reproductive health and rights in their countries.

In her previous experiences, Belinda executed events at global conferences, developed in-person and digital learning curricula, hosted capacity building workshops, and carried out studies and programs in domestic and international settings. Currently, she is an active participant of the Climate Reality Project NYC Chapter’s Food Committee, the #SaveOurCompost coalition’s social media team, and uses her sustainability platform to cover topics on intersectional environmentalism, her personal low impact living journey, and her interest in food sovereignty.


Belinda holds a BA degree in Psychology from the Macaulay Honors Program at Baruch College and a MSPH degree specializing in Social and Behavioral Interventions from the Johns Hopkins Bloomberg School of Public Health.

Prior to joining Think Zero as an associate, Alex spent three years as a management and technology consultant at RSM. He has a passion for the environment and waste reduction and hopes to one day have a regenerative farm. 


Alex holds a BA in Urban Planning from Binghamton University and is an accredited LEED Green Associate by USGBC.


Alexander Greenbaum